|Implementation and efficiency of steganographic techniques in bitmapped images and embedded data survivability against lossy compression schemes - Currie, Daniel L.;Campbell, Hannelore.|
Thesis advisor(s): Cynthia E. Irvine, Harold Fredricksen
Keywords: Cryptography; Data compression (Computer science)
|Data compression and archiving software implementation and their algorithm comparison - Jung, Young Je.|
Thesis Advisor: Yang, Chyan
Keywords: Data compression (Computer science) Software
|Computational Nanotechnology of Materials, Devices, and Machines: Carbon Nanotubes - Srivastava, Deepa|
The mechanics and chemistry of carbon nanotubes have relevance for their numerous electronic applications. Mechanical deformations such as bending and twisting affect the nanotube's conductive properties, and at the same time they possess high strength and elasticity. Two principal techniques were utilized including the analysis of large scale classical molecular dynamics on a shared memory architecture machine and a quantum molecular dynamics methodology...
Keywords: ALGORITHMS; DATA COMPRESSION; CODING; ARCHITECTURE (COMPUTERS)
|A firmware data compression unit (Volume Report (University of Illinois at Urbana-Champaign. Dept. of Computer Science) no. 617) - Tao, William Yan-Yuen|
Keywords: Data compression (Electronic computers); Lockheed SUE (Computer)
|Data compression for character strings (Volume Report (University of Illinois at Urbana-Champaign. Dept. of Computer Science) no. 659) - Weaver, Alfred Charles|
Keywords: Data compression (Telecommunication); Data transmission systems
|The enhancement of data by data compression using polynomial fitting - Kizner, W|
Data enhancement by data compression using polynomial fitting
Keywords: AUGMENTATION; CHEBYSHEV APPROXIMATION; DATA COMPRESSION; FITTING; POLYNOMIALS; DATA COMPRESSOR; POLYNOMIAL
|National Aeronautics and Space Administration (NASA)/American Society for Engineering Education (ASEE) Summer Faculty Fellowship Program: 1996 - NON|
The objectives of the program, which began nationally in 1964 and at JSC in 1965 are to (1) further the professional knowledge qualified engineering and science faculty members, (2) stimulate an exchange of ideas between participants and NASA, (3) and refresh the research and teaching activities of participants' institutions, and (4) contribute to the research objectives of NASA centers. Each faculty fellow spent at least 10 weeks at JSC engaged in a research project in collaboration with a NASA...
Keywords: DATA COMPRESSION; DATA ACQUISITION; INFORMATION SYSTEMS; EARTH SCIENCES; CONFERENCES; INDUSTRIES
|The solid system. II. numeric compression. / the solid system. III. alphanumeric compression (Volume NBS Technical Note 413) - deMaine, Paul A. D.; Marron, B. A.; Kloss, K.;|
This part of NBS Technical Note 413 desribes the general NUMERIC COMPRESSOR (NUPAK) Algorithm for *automatically compressing (encoding) or decoding compressed numerical information, which may of course have come from graphical information.The amount of co
Keywords: Computer input-output equipment; Data compression (Telecommunication); Computer storage devices
|A Novel Approach of Modified Run Length Encoding Scheme for High Speed Data Communication Application - S. Joseph, N. Srikanth, J. E. N.Abhilash|
This paper presents a Modified Run Length Encoding (RLE) Scheme for High Speed Data Compression. Compression isefficient technique to reduce the memory occupancy and to improve the performance of the system from many available techniques tooccupancy of memory. RLE is one in substantial compression algorithm which can reduce memory use. The major improvement incompression rate and limitations and improving the speed of the system performance in RLE scheme, are discussed in this researchpaper...
Keywords: Compression Rate; Data Compression; Data Recovery; Run Length Encoding (RLE); VHDL
|NASA PPO microgravity projects support - Smith, Janice F|
Work progress is reported in brief. A summary of this information is provided below. An in-depth study was performed to evaluate a new European designed Borack Freezer/Cooler for possible shuttle middeck flight to support advanced protein crystal growth (APCG) experimentation. A statement of work was prepared for the design and development of a glovebox for proposed flight in the shuttle middeck. Work was also initiated to perform an analysis of low-g accelerometer data relative to Fluid Experim...
Keywords: DATA COMPRESSION; INFORMATION SYSTEMS; TELECOMMUNICATION; CODERS; COLOR CODING; DIFFERENTIAL PULSE CODE MODULATION; REMOTE SENSING; SIMULATION
|Comparison of wind tunnel test results at free stream Mach 0.7 with results from the Boeing TEA-230 subsonic flow method - Mohn, L. W|
The use of the Boeing TEA-230 Subsonic Flow Analysis method as a primary design tool in the development of cruise overwing nacelle configurations is presented. Surface pressure characteristics at 0.7 Mach number were determined by the TEA-230 method for a selected overwing flow-through nacelle configuration. Results of this analysis show excellent overall agreement with corresponding wind tunnel data...
Keywords: CODING; DATA LINKS; DATA TRANSMISSION; SPACE SHUTTLE ORBITERS; DATA COMPRESSION; DIGITAL DATA; TELECOMMUNICATION
|USING THE LIGHT SCATTERING FUNCTION FOR STUDYING SUSPENDED MATTER IN THE SEA - SHIFRIN, K. S.|
THE ANGULAR DISTRIBUTION OF THE LIGHT SCATTERED BY SEA WATER AND ITS INTENSITY ARE DETERMINED BY THE QUANTITY, THE DIMENSIONS, AND THE SHAPE OF THE PARTICLES SUSPENDED IN THE SEA WATER. BY MEASURING THE LIGHT SCATTERING FUNCTIONS (PHASE FUNCTIONS) THE OPTICAL INFORMATION CAN BE USED TO CALCULATE THE SIZE DISTRIBUTION OF THE PARTICLES SUSPENDED IN THE WATER. TWO INSTRUMENTS ARE USED FOR MEASURING THE SCATTERING ENVELOPES OF SEA WATER; A VISUAL SPECTRO-HYDRONEPHELOMETER TRANSMISSION METER AND AN O...
Keywords: ANALOG DATA; DATA COMPRESSION; SIGNAL PROCESSING; TELEMETRY; ALGORITHMS; ERRORS; RESTORATION; SIMULATION
|Proceedings of the 16th NASA Propagation Experimenters Meeting (NAPEX 16) and the Advanced Communications Technology Satellite (ACTS) Propagation Studies Miniworkshop - NON|
The NASA Propagation Experimenters Meeting (NAPEX), supported by the NASA Propagation Program, is convened annually to discuss studies made on radio wave propagation by investigators from domestic and international organizations. NAPEX 16 was held on May 29, 1992 in Houston, Texas. The meeting was organized into two technical sessions. The first session was dedicated to slant path propagation studies and measurements...
Keywords: COMPRESSION RATIO; DATA COMPRESSION; DATA PROCESSING; FRACTALS; IMAGE PROCESSING; IMAGERY; HIGH RESOLUTION; INFORMATION
|An experimental trace gas investigation of fluid transport and mixing in a circular-to-rectangular transition duct - Reichert, B. A.|
An ethylene trace gas technique was used to map out fluid transport and mixing within a circular to rectangular transition duct. Ethylene gas was injected at several points in a cross stream plane upstream of the transition duct. Ethylene concentration contours were determined at several cross stream measurement planes spaced axially within the duct. The flow involved a uniform inlet flow at a Mach number level of 0.5...
Keywords: DATA COMPRESSION; UNIX (OPERATING SYSTEM); VAX COMPUTERS; COMPUTER PROGRAMMING; COMPUTER PROGRAMS; FEEDBACK
|Procedure for generating global atmospheric engine emissions data from future supersonic transport aircraft. The 1990 high speed civil transport studies - Sohn, R. A.|
The input for global atmospheric chemistry models was generated for baseline High Speed Civil Transport (HSCT) configurations at Mach 1.6, 2.2, and 3.2. The input is supplied in the form of number of molecules of specific exhaust constituents injected into the atmosphere per year by latitude and by altitude (for 2-D codes). Seven exhaust constituents are currently supplied: NO, NO2, CO, CO2, H2O, SO2, and THC (Trace Hydrocarbons)...
Keywords: ALGORITHMS; BANDWIDTH; CODING; DATA COMPRESSION; SIGNAL DISTORTION; CHANNEL CAPACITY; CODERS; DECODERS; TRADEOFFS
|Cloud identification using genetic algorithms and massively parallel computation - Buckles, Bill P.|
As a Guest Computational Investigator under the NASA administered component of the High Performance Computing and Communication Program, we implemented a massively parallel genetic algorithm on the MasPar SIMD computer. Experiments were conducted using Earth Science data in the domains of meteorology and oceanography. Results obtained in these domains are competitive with, and in most cases better than, similar problems solved using other methods...
Keywords: REMOTE SENSING; CAMERAS; TETHERED SATELLITES; DATA COMPRESSION; DIGITAL DATA; TETHERING; SPACE SHUTTLES; DOWNLINKING; IMAGING TECHNIQUES
|Advanced technology development multi-color holography - Vikram, Chandra S|
This is the final report of the Multi-color Holography project. The comprehensive study considers some strategic aspects of multi-color holography. First, various methods of available techniques for accurate fringe counting are reviewed. These are heterodyne interferometry, quasi-heterodyne interferometry, and phase-shifting interferometry. Phase-shifting interferometry was found to be the most suitable for multi-color holography...
Keywords: ADJUSTING; CODING; DATA COMPRESSION; DATA PROCESSING; DATA SYSTEMS; IMAGE PROCESSING; EARTH SCIENCES; LOSSES; SPECTRA
|Application of Interferometric Radars to Planetary Geologic Studies - Mouginis-Mark, P. J.|
Radar interferometry is rapidly becoming one of the major applications of radar systems in Earth orbit. So far the 2000 flight of the Shuttle Radar Topographic Mission (SRTM) is the only dedicated U.S. radar to be flown for the collection of interferometric data, but enough has been learned from this mission and from the use of foreign partner radars (ERS-1/2, Radarsat, ENIVISAT and JERS-1) for the potential planetary applications of this technique to be identified...
Keywords: DATA COMPRESSION; IMAGE PROCESSING; WAVELET ANALYSIS; DATA PROCESSING; BITS; PIXELS; ERRORS; BIT ERROR RATE; PUSHBROOM SENSOR MODES
|Knowledge-based machine indexing from natural language text: Knowledge base design, development, and maintenance - Genuardi, Michael T|
One strategy for machine-aided indexing (MAI) is to provide a concept-level analysis of the textual elements of documents or document abstracts. In such systems, natural-language phrases are analyzed in order to identify and classify concepts related to a particular subject domain. The overall performance of these MAI systems is largely dependent on the quality and comprehensiveness of their knowledge bases...
Keywords: DATA COMPRESSION; SELECTION; DATA STORAGE; IMAGE PROCESSING; LOSSES; OPTICAL DISKS; READ-ONLY MEMORY DEVICES; ALGORITHMS; COMPRESSION RATIO; PRECISION
|Nuclear propulsion technology advanced fuels technology - Stark, Walter A., Jr|
Viewgraphs on advanced fuels technology are presented. Topics covered include: nuclear thermal propulsion reactor and fuel requirements; propulsion efficiency and temperature; uranium fuel compounds; melting point experiments; fabrication techniques; and sintered microspheres.
Keywords: ASTRONOMY; PHOTOGRAPHIC PLATES; SKY SURVEYS (ASTRONOMY); DATA COMPRESSION; IMAGE PROCESSING; LOSSES; PIXELS; ALGORITHMS; CAMERAS; HUBBLE SPACE TELESCOPE; MOSAICS
|Speculations on Orbital Forcing of Sublimation from the Polar Caps - Hecht, M. H|
Calculation of the periodic variations in the martian orbital parameters by Ward and subsequent refinements to the theory have inspired numerous models of variation of the martian water cycle. The limitations of models such as this can not be overstated. Albedo, for example, has a much greater influence on temperature than orbital forcing, and seems to be linked to insolation, possibly via its influence on dust transport...
Keywords: MISSION PLANNING; MICRODENSITOMETERS; LASERS; SCANNERS; SKY SURVEYS (ASTRONOMY); SPACEBORNE TELESCOPES; ULTRAVIOLET RADIATION; DIGITAL SYSTEMS; DATA COMPRESSION; ALGORITHMS; IMAGE ANALYSIS; AUGMENTATION
|Ares I-X Launch Vehicle Modal Test Measurements and Data Quality Assessments - Templeton, Justin D|
The Ares I-X modal test program consisted of three modal tests conducted at the Vehicle Assembly Building at NASA s Kennedy Space Center. The first test was performed on the 71-foot 53,000-pound top segment of the Ares I-X launch vehicle known as Super Stack 5 and the second test was performed on the 66-foot 146,000- pound middle segment known as Super Stack 1. For these tests, two 250 lb-peak electro-dynamic shakers were used to excite bending and shell modes with the test articles resting on t...
Keywords: PRECIPITATION (METEOROLOGY); REMOTE SENSING; PRECIPITATION MEASUREMENT; RAIN; DATA BASES; DATA PRODUCTS; DATA COMPRESSION; METEOROLOGICAL RADAR; MICROWAVE IMAGERY; TRMM SATELLITE
|Research in network data management and resource sharing : preliminary experimental system design report (Volume CAC No. 170) - Bunch, Steve R|
The basic design of an experimental distributed data management system is presented. The system is based upon the relational model. (Author)
Keywords: Information Science; Data management; Information systems; Mathematical models; Sharing; Resource management; Flow charting; Data compression; Network flows
|Conceptual design for the Space Station Freedom fluid physics/dynamics facility - Thompson, Robert L.|
A study team at NASA's Lewis Research Center has been working on a definition study and conceptual design for a fluid physics and dynamics science facility that will be located in the Space Station Freedom's baseline U.S. Laboratory module. This modular, user-friendly facility, called the Fluid Physics/Dynamics Facility, will be available for use by industry, academic, and government research communities in the late 1990's...
Keywords: ALGORITHMS; ERRORS; JUDGMENTS; RADAR DATA; CODING; DATA COMPRESSION; EVALUATION; IMAGE PROCESSING; MEAN SQUARE VALUES; SYNTHETIC APERTURE RADAR; ACCEPTABILITY; CRITERIA
|Ultra-light duct for an anechoic wind tunnel - Lambourion, J.|
A tunnel ultra-light (or TUL) is a duct composed of acoustically transparent cloth designed to transform an open-jet wind tunnel into a closed-jet wind tunnel. This concept is of interest (a priori) for anechoic wind tunnels because it improves the aerodynamic quality without hindering the measurement of sound in the far field. A full scale device designed for the 3 m diameter test section of CEPRA 19 was described...
Keywords: DATA COMPRESSION; DATA TRANSMISSION; IMAGE PROCESSING; RADAR IMAGERY; REAL TIME OPERATION; SYNTHETIC APERTURE RADAR; ALGORITHMS; DIGITAL TECHNIQUES; SATELLITE IMAGERY
|A Regeneratively Cooled Thrust Chamber For The Fastrac Engine - Brown, Kendall K.|
Abstract This paper presents the development of a low-cost, regeneratively-cooled thrust chamber for the Fastrac engine. The chamber was fabricated using hydraformed copper tubing to form the coolant jacket and wrapped with a fiber reinforced polymer composite Material to form a structural jacket. The thrust chamber design and fabrication approach was based upon Space America. Inc.'s 12,000 lb regeneratively-cooled LOX/kerosene rocket engine...
Keywords: DATA COMPRESSION; EMBEDDING; REAL TIME OPERATION; ERROR ANALYSIS; ALGORITHMS; DISCRETE COSINE TRANSFORM; IMAGING TECHNIQUES; TECHNOLOGY UTILIZATION; INTEGRATED CIRCUITS; SPACECRAFT INSTRUMENTS
|Modeled Seasonal Variations of Firn Density Induced by Steady State Surface Air Temperature Cycle - Jun, Li|
Seasonal variations of firn density in ice-sheet firn layers have been attributed to variations in deposition processes or other processes within the upper firn. A recent high-resolution (mm scale) density profile, measured along a 181 m core from Antarctica, showed small-scale density variations with a clear seasonal cycle that apparently was not-related to seasonal variations in deposition or known near-surface processes (Gerland and others 1999)...
Keywords: PROGRAM VERIFICATION (COMPUTERS); INFORMATION TRANSFER; COMPUTER PROGRAMS; DATA COMPRESSION; MESSAGES; SOFTWARE ENGINEERING; DATA ACQUISITION; HUMAN-COMPUTER INTERFACE
|DESCANSO Design & Performance Summary Series - Article 4 Voyager Telecommunications - Roger Ludwig|
Keywords: NASA; JPL; voyager; spacecraft; downlink; telemetry; command; antenna; uplink; dsn; mission; telecom system; voyager interstellar; interstellar mission; deep space; voyager spacecraft; system performance; data compression
|Flow instability in particle-bed nuclear reactors - Kerrebrock, Jack L|
The particle-bed core offers mitigation of some of the problems of solid-core nuclear rocket reactors. Dividing the fuel elements into small spherical particles contained in a cylindrical bed through which the propellant flows radially, may reduce the thermal stress in the fuel elements, allowing higher propellant temperatures to be reached. The high temperature regions of the reactor are confined to the interior of cylindrical fuel assemblies, so most of the reactor can be relatively cool...
Keywords: ACCEPTABILITY; CENTRIFUGES; DISPLAY DEVICES; RODENTS; VIEWING; COMPRESSIBILITY EFFECTS; DATA COMPRESSION; HABITATS; IMAGE PROCESSING; LIFE SCIENCES; SPACE STATION FREEDOM; VIDEO COMPRESSION; CAMERAS
|Development of Design Tools for Flow-Control Actuators - Mathew, Jose|
This report discusses the: 1. Development coupled electro/fluid/structural lumped-element model (LEM) of a prototypical flow-control actuator. 2. Validation the coupled electro/fluid/structural dynamics lumped-element models. 3. Development simple, yet effective, design tools for actuators. 4. Development structural dynamic models that accurately characterize the dynamic response of piezoelectric flap actuators using the Finite Element Method (FEW as well as analytical methods...
Keywords: ANEMOMETERS; FREQUENCY RESPONSE; LOW SPEED; PNEUMATIC PROBES; SHEAR LAYERS; TURBOCOMPRESSORS; THERMAL ANALYSIS; UNSTEADY FLOW; VELOCITY; DATA COMPRESSION; ALGORITHMS; CALIBRATING; DECOMPOSITION; FREE JETS
|Machine aided indexing from natural language text - Silvester, June P.|
The NASA Lexical Dictionary (NLD) Machine Aided Indexing (MAI) system was designed to (1) reuse the indexing of the Defense Technical Information Center (DTIC); (2) reuse the indexing of the Department of Energy (DOE); and (3) reduce the time required for original indexing. This was done by automatically generating appropriate NASA thesaurus terms from either the other agency's index terms, or, for original indexing, from document titles and abstracts...
Keywords: DATA COMPRESSION; BANDWIDTH; DATA STORAGE; SMOOTHING; TDR SATELLITES; DATA REDUCTION; DATA SYSTEMS; HARDWARE; LOSSES; ONBOARD DATA PROCESSING; ACCESS TIME; ADAPTATION; ALGORITHMS
|Evaluation of Refractivity Profiles from CHAMP and SAC-C GPS Radio Occultation - Poli, Paul|
The GeoForschungsZentrum's Challenging Minisatellite Payload for Geophysical Research and Application (CHAMP, Germany-US) and the Comision Nacional de Actividades Especiales' Satelite de Aplicaciones Cientificas-C (SAC-C, Argentina-US) missions are the first missions to carry a second-generation Blackjack Global Positioning System (GPS) receiver. One of the new features of this receiver is its ability to sense the lower troposphere closer to the surface than the proof-of-concept GPS Meteorology ...
Keywords: AIRBORNE/SPACEBORNE COMPUTERS; ALGORITHMS; ARCHITECTURE (COMPUTERS); ONBOARD DATA PROCESSING; DATA COMPRESSION; SPECTRUM ANALYSIS; DATA FLOW ANALYSIS; APPLICATIONS PROGRAMS (COMPUTERS); SPACECRAFT DESIGN; COMMERCIAL OFF-THE-SHELF PRODUCTS; COST EFFECTIVENESS
|Identification, Characterization, and Exploration of Environments for Life on Mars - Acevedo, Sara E|
A bibliography (18 references) listing the publications during the current grant period of The Center for the Study of Life in the Universe, part of the SETI (Search for Extraterrestrial Intelligence) Institute is presented. The publications, from the Period of Performance September 1, 2000 to February 28, 2002, primarily cover Mars and its potential for life, as well as extreme environments and primitive life forms on Earth...
Keywords: TIME DEPENDENCE; COMPUTERIZED SIMULATION; UNSTEADY FLOW; TURBINE PUMPS; INCOMPRESSIBLE FLOW; SPACE SHUTTLE MAIN ENGINE; REUSABLE LAUNCH VEHICLES; PARALLEL PROCESSING (COMPUTERS); DATA COMPRESSION
|Design and Testing of Flight Control Laws on the RASCAL Research Helicopter - Frost, Chad R.|
Two unique sets of flight control laws were designed, tested and flown on the Army/NASA Rotorcraft Aircrew Systems Concepts Airborne Laboratory (RASCAL) JUH-60A Black Hawk helicopter. The first set of control laws used a simple rate feedback scheme, intended to facilitate the first flight and subsequent flight qualification of the RASCAL research flight control system. The second set of control laws comprised a more sophisticated model-following architecture...
Keywords: DATA COMPRESSION; INTEGRATED CIRCUITS; WAVELET ANALYSIS; DETECTORS; BITS; PERFORMANCE TESTS; TECHNOLOGY UTILIZATION; AEROSPACE SCIENCES; ALGORITHMS; IMAGING TECHNIQUES; COMPUTER SYSTEMS PERFORMANCE; ARCHITECTURE (COMPUTERS); APPLICATIONS PROGRAMS (COMPUTERS); CODERS
|An Approximate Dissipation Function for Large Strain Rubber Thermo-Mechanical Analyses - Johnson, Arthur R.|
Mechanically induced viscoelastic dissipation is difficult to compute. When the constitutive model is defined by history integrals, the formula for dissipation is a double convolution integral. Since double convolution integrals are difficult to approximate, coupled thermo-mechanical analyses of highly viscous rubber-like materials cannot be made with most commercial finite element software. In this study, we present a method to approximate the dissipation for history integral constitutive model...
Keywords: CIVIL AVIATION; SOFTWARE DEVELOPMENT TOOLS; DOCUMENT MARKUP LANGUAGES; FORMAT; DATA PROCESSING; OPERATING SYSTEMS (COMPUTERS); DATA COMPRESSION; APPLICATIONS PROGRAMS (COMPUTERS); INTEROPERABILITY; RELATIONAL DATA BASES
|Tsien's method for generating non-Keplerian trajectories. Part 2: The question of thrust to orbit a sphere and the restricted three-body problem - Murad, P. A|
Tsien's method is extended to treat the orbital motion of a body undergoing accelerations and decelerations. A generalized solution is discussed for the generalized case where a body undergoes azimuthal and radial thrust and the problem is further simplified for azimuthal thrust alone. Judicious selection of thrust could generate either an elliptic or hyperbolic trajectory. This is unexpected especially when the body has only enough energy for a lower state trajectory...
Keywords: DATA COMPRESSION; EARTH OBSERVATIONS (FROM SPACE); ENVIRONMENTAL MONITORING; DATA SYSTEMS; EARTH OBSERVING SYSTEM (EOS); EARTH SCIENCES; IMAGE PROCESSING; INFORMATION SYSTEMS; REMOTE SENSING; SIGNAL PROCESSING; EARTH ENVIRONMENT
|Vickers indentation hardness of stoichiometric and reduced single crystal TiO2 (rutile) from 25 to 800 C - Dellacorte, Christopher|
The indentation microhardness of stoichiometric and reduced single crystal rutile (TiO2) from 25 to 800 C is presented in this paper. The results serve two main purposes. One is to assess the effect of rutile's stoichiometry on its hardness. The other is to test recently suggested theory on solid lubrication with sub Stoichiometric rutile in an effort to better understand shear controlled phenomenon...
Keywords: CODERS; DOWNLINKING; HARDWARE; LOW EARTH ORBITS; METEOROLOGICAL INSTRUMENTS; COMPRESSION RATIO; DATA COMPRESSION; DATA PROCESSING; EMISSION SPECTRA; IMAGERY; METEOROLOGY; CHIPS; DISCRETE COSINE TRANSFORM
|Non-linear boundary-layer receptivity due to distributed surface roughness - Amer, Tahani Reffe|
The process by which a laminar boundary layer internalizes the external disturbances in the form of instability waves is known as boundary-layer receptivity. The objective of the present research was to determine the effect of acoustic excitation on boundary-layer receptivity for a flat plate with distributed variable-amplitude surface roughness through measurements with a hot-wire probe. Tollmien-Schlichting mode shapes due to surface roughness receptivity have also been determined, analyzed, a...
Keywords: ENGINE MONITORING INSTRUMENTS; PROPULSION SYSTEM PERFORMANCE; FAULT DETECTION; MACHINE LEARNING; NEURAL NETS; ROCKET ENGINES; SYSTEMS HEALTH MONITORING; ARCHITECTURE (COMPUTERS); DATA COMPRESSION; ERROR ANALYSIS
|Stability analysis of an F/A-18 E/F cable mount m odel - Thompson, Nancy|
A full-span F/A-18 E/F cable mounted wind tunnel model is part of a flutter clearance program at the NASA Langley Transonic Dynamics Tunnel. Parametric analysis of this model using GRUMCBL software was conducted to assess stability for wind tunnel tests. Two configurations of the F/A-18 E/F were examined. The parameters examined were pulley-cable friction, mach number, dynamic pressure, cable geometry, center of gravity location, cable tension, snubbing the model, drag, and test medium...
Keywords: ALGORITHMS; FLOW DISTRIBUTION; PRESSURE GRADIENTS; TURBULENCE; COMPUTATIONAL FLUID DYNAMICS; HILSCH TUBES; NUMERICAL FLOW VISUALIZATION; PREDICTOR-CORRECTOR METHODS; TURBULENT FLOW; VORTICES; VORTICITY; DATA COMPRESSION
Keywords: scorpion; drive; scsi; data; cartridge; dds; tape; compression; internal; seagate; internal scorpion; data compression; external scorpion; tape cartridge; tape drive; flash memory; firmware upgrade; transfer rate; host computer; helical scan
Keywords: modem; data; command; dce; remote; fax; mode; leased; dial; cellular; error control; result code; user profile; digital loopback; flow control; data compression; remote digital; remote modem; front panel; series modems
Keywords: modem; driver; command; isi; installation; click; ports; windows; install; modems; user guide; driver installation; result codes; hardware wizard; grant moh; driver files; isi card; result code; dialog box; data compression
|DESCANSO Design & Performance Summary Series - Article 5 Galileo Telecommunications - Jim Taylor|
Keywords: NASA; JPL; galileo; data; downlink; orbiter; spacecraft; mission; uplink; antenna; telemetry; probe; carrier; telecom; deep space; galileo spacecraft; link performance; telecom link; galileo orbiter; data rate; downlink carrier; ground system; feedback concatenated; data compression
Keywords: isdn; zyxel; command; call; data; commands; reference; series; technical; protocol; technical reference; reference forzyxel; pots port; dec hex; flash key; phone number; bit dec; zyxel isdn; result code; data compression
|Satellite Sensed Skin Sea Surface Temperature - Donlon, Crai|
Quantitative predictions of spatial and temporal changes the global climate rely heavily on the use of computer models. Unfortunately, such models cannot provide the basis for climate prediction because key physical processes are inadequately treated. Consequently, fine tuning procedures are often used to optimize the fit between model output and observational data and the validation of climate models using observations is essential if model based predictions of climate change are to be treated ...
Keywords: PLANETARY IONOSPHERES; PLANETARY ATMOSPHERES; PLANETARY ATMOSPHERES; DATA COMPRESSION; MARS PROBES; SOLAR CYCLES; MARS (PLANET); MARS SURFACE; ATMOSPHERIC STRATIFICATION; WAVE PROPAGATION; RADIO WAVES; ATMOSPHERIC SOUNDING; IONOSPHERIC DISTURBANCES; RADIO TRANSMISSION; REMOTE SENSING; ATMOSPHERIC SOUNDING; IONOSPHERIC DISTURBANCES
Keywords: modem; dial; connect; bps; data; codes; online; mode; command; carrier; result codes; serial port; detected carrier; power supply; originate call; led lights; error correction; flow control; data compression; command mode
|Nacelle Integration to Reduce the Sonic Boom of Aircraft Designed to Cruise at Supersonic Speeds - Mack, Robert J|
An empirical method for integrating the engine nacelles on a wing-fuselage-fin(s) configuration has been described. This method is based on Whitham theory and Seebass and George sonic-boom minimization theory, With it, both reduced sonic-boom as well as high aerodynamic efficiency methods can be applied to the conceptual design of a supersonic-cruise aircraft. Two high-speed civil transport concepts were used as examples to illustrate the application of this engine-nacelle integration methodolog...
Keywords: FUZZY SYSTEMS; CLUMPS; COGNITION; CONTINUOUS RADIATION; DECISION THEORY; PROBABILITY THEORY; SENSE ORGANS; VISUAL PERCEPTION; WORDS (LANGUAGE); DATA COMPRESSION; DATA PROCESSING; HUMAN PERFORMANCE; LANGUAGES; MENTAL PERFORMANCE; COMPUTER PROGRAMS; ANALOGIES; BRAIN
|Implementation of the Baldwin-Barth turbulence model into the ZETA code and its diagnosis - Low, Scott L|
The Baldwin-Barth turbulence model was implemented into Zeta, a time-accurate, zonal, integro-differential code for incompressible laminar and turbulent flows. The implementation procedure is patterned after the model subroutine in ARC2D. The results of ZETA with the Baldwin-Barth turbulence model were compared with experimental data, with ZETA using Baldwin-Lomax model, and with ARC2D using the Baldwin-Barth model...
Keywords: DATA BASE MANAGEMENT SYSTEMS; DECOMMUTATORS; FILE MAINTENANCE (COMPUTERS); SATELLITE CONTROL; SATELLITE INSTRUMENTS; SATELLITE TRANSMISSION; DATA BASES; DATA COMPRESSION; DATA MANAGEMENT; DATA STORAGE; DECODING; TELEMETRY; TRANSMISSION RATE (COMMUNICATIONS); ACCESS TIME
Keywords: modem; command; data; commands; mode; bps; click; fax; dial; dialing; flow control; error correction; dial tone; cancel click; bps modem; limited warranty; data compression; command set; data rates; user profile
Keywords: modem; command; data; bps; carrier; connect; connected; dial; connection; click; data carrier; carrier detected; bps data; result codes; serial port; digital loopback; data compression; data communications; bps connected; technical support